SimplyInfo » Entries tagged with "unit 3"
TEPCO Begins Installing Unit 3 Defueling Building
TEPCO began installing the first sections of the defueling building this week. The decking is the first portion of what will be a cover building to allow the removal of spent fuel from unit 3′s spent fuel pool. The defueling building is built in a modular fashion to allow for mostly remote assembly. The actual removal will also be done remotely due to the high radiation levels on unit 3′s remaining refueling floor level. Further details … Read entire article »
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Fukushima Unit 3 Spent Fuel Removal Work Begins
The process to remove the spent fuel from the pool at unit 3 will be a long term project but significant work begins in 2016. TEPCO’s schedule shows the work to install the cover building and platform should start around March of 2016. Once that installation work is completed, underwater small debris removal will begin around mid 2017. Actual removal of the spent fuel would not begin until early 2018. All of this work will need … Read entire article »
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Fukushima Unit 3 3D Torus Scans Begin
3D inspections of the unit 3 torus room are set to begin December 22nd. This work is expected to investigate all of the torus room except the section where a robot was lost in 2011. TEPCO has not disclosed what has happened in that area to make it off limits. The work should continue into January 2016 and is part of the larger effort to determine leak paths and damage to the unit towards future … Read entire article »
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TEPCO Makes Two New Big Admissions On Fukushima Disaster
TEPCO has made two major admissions on the Fukushima nuclear disaster. The Japanese press has documented these two out of a large data dump of accident review reports. Unit 2: The new admission for unit 2 was that the pneumatic air controls for the steam relief valves failed early in the disaster. These air lines are used to open and close steam relief valves (SRV) to relieve pressure on the reactor vessel. Our extended report on unit … Read entire article »
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Fukushima Unit 3 New Hatch Investigation
TEPCO sent the small 3D printed robot equipped with a smart phone into inspect the unit 3 containment hatch a second time. Video from the robot along with video taken by a scope inserted into the space near the hatch provided a good view of the conditions in this area. It did not include radiation readings. The robot was controlled via a group of WIFI repeaters. The robot found considerable corrosion along the connection of the … Read entire article »
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New Analysis Shows Fukushima Unit 3 Released High Concentration Of Contamination
Yomiuri Shimbun is reporting a new analysis by Japan Atomic Energy Agency that shows Fukushima unit 3 may have released a high concentration of contamination northwest of the plant. Their analysis assumed that the release happened late in the evening of March 15, 2011 to early morning March 16th. Yomiuri reports that JAEA assumes a venting could have caused the release, but the last venting publicly documented by TEPCO was on 10:15pm March 14th. If … Read entire article »
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Fukushima Unit 3 Second Containment Inspection Results
TEPCO states that data gathered will be released later. They have released some images of the second day of containment inspections. TEPCO found what they described as sediment in the new photos. The sediments are in the underwater section of the inspection. One curious visual is a floor grating with some form of dense sediment able to span the gaps in the grating. It is also found stuck to horizontal surfaces in circular blobs. The … Read entire article »
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Fukushima Unit 3 First Photos Inside Containment
TEPCO has released a set of images taken inside the containment structure of unit 3 on March 20th. This is the first work since the 2011 disaster to look inside the containment structure of unit 3. What was found was both expected and surprising. Compared to damage found around the unit 3 reactor building interior, this section of the containment structure didn’t show that level of damage. In portions of the reactor building mangled doors and … Read entire article »
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Fukushima Unit 3 Containment Probe On October 20th
TEPCO quietly announced that October 20th they would conduct the first containment inspection of unit 3. This is significant work as the building has been limited for entry due to damage and high radiation levels. Robotic decontamination has been under way in the building for more than a year. TEPCO did not mention what the radiation levels would be near the work area. It appears they are using a rig similar to what has been used … Read entire article »
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Japan NRA Begins Restart Checks On Reactor Under Court Injunction Not To Run
NRA is doing pre-restart inspections on Takahama unit 3, even after the potential restart of the reactor was blocked by a court injunction earlier this year. This comes a day after the NRA made a startling claim that they considered the nearby volcano to the Sendai nuclear plant to be of no concern even as it began erupting. This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at … Read entire article »
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Fukushima Unit 3 Fuel Crane Removed From Spent Fuel Pool
TEPCO successfully removed the fuel handling crane from the spent fuel pool on August 2nd amid problems with fog. The work began around 11am where crane could be seen working in the pool. The machine was finally pulled and set on the ground around 1:18pm JST. The work was already challenging and high risk without adding fog into the complexity. TEPCO didn’t report any problems, they also did not say what would happen to the … Read entire article »
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Fukushima Unit 3 Seawater Trench Concreting Completed
TEPCO announced that they have completed the concreting of the unit 3 seawater piping trench system. Two vertical shafts are being filled currently to complete the last of this project. http://www.tepco.co.jp/en/nu/fukushima-np/handouts/2015/images/handouts_150730_01-e.pdf This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org © 2011-2016 SimplyInfo.org, Fukuleaks.org All Rights Reserved Content cited, quoted etc. from other sources is under the respective rights of that content owner. If you are viewing this page … Read entire article »
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Fukushima Unit 3 Crane To Be Removed From Pool August 2nd
The remains of the unit 3 fuel handling crane will be removed from the spent fuel pool August 2nd. TEPCO has not released further information on the decision to do this work on a weekend during a traditional summer holiday time. They have claimed to be taking worker safety more seriously. TEPCO has not specifically cited any expected radiation release with the crane removal. The work is risky due to the proximity to the fuel … Read entire article »
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Fukushima Unit 3 Fuel Crane To Be Removed This Week
TEPCO plans to remove the remains of the fuel crane from the pool this week using a special pair of hooks this week. Other work will be suspended at the plant while this takes place. TEPCO halted work on the unit 3 spent fuel pool when it was discovered that the crane was close to the fuel gate. Additional work was conducted to estimate the condition of the gate and the chances of damaging it … Read entire article »
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Fukushima Unit 3 Decommissioning Plan Released
TEPCO released significant new information about the plan and progress for dealing with unit 3′s spent fuel pool. The report was buried among other documents related to periodic reporting and didn’t receive any press in Japan. Radiation levels are a constant problem for this work effort. A significant portion of the planning has gone into ways to lower the radiation doses on the refueling floor even though work such as crane operations will be done remotely … Read entire article »
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Fukushima Unit 3 Containment Inspection To Start October 2015
TEPCO and IRID recently published details on the first efforts to probe the unit 3 reactor at Fukushima Daiichi. In October 2015 we should see the first images from inside the containment structure. Unit 3 was the site of the massive explosion during the reactor meltdowns. High radiation levels in the building have so far prevented workers from conducting any inspections into the reactor systems. The work will also install equipment to better monitor conditions … Read entire article »
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Fukushima Daiichi Unit 3 Spent Fuel Pool Gate Inspected
The unit 3 spent fuel pool gate was inspected further after concerns that the fuel handling crane could have damaged the gate. The inspections produced a number of photos of the condition of the gates. This overhead view shows the two gates for the spent fuel pool along with the concrete reactor cover from above. The G2 gate is clearly dislodged from the normal position. This could have been the result of the blast during the meltdown. … Read entire article »
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Fukushima Unit 3 Spent Fuel Pool Gate Damaged
NHK is reporting that TEPCO has admitted that two spent fuel pool gates at unit 3 are damaged. They described the first gate as being shifted out of position and that it likely was caused by the refueling crane when it fell into the pool during the blast. The utility considers the second gate to also be shifted but didn’t elaborate. They are currently working on determining if removing the remaining sections of the crane might cause the … Read entire article »
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Fukushima Daiichi Unit 3 Fuel Removal To Start Within Year
TEPCO told Yomiuri Shimbun that they expect to begin removing spent fuel at the unit 3 reactor within the 2015 fiscal year. Work to remove the damaged fuel handling crane has been delayed until April due to the complexity of the task. TEPCO will need to install a cover building vaguely similar to the one installed on unit 4. The building for unit 3 will have to work around existing structural and technical challenges unique to … Read entire article »
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Oil Leak In Fukushima Daiichi Unit 3 Spent Fuel Pool
An oil leak occurred in the spent fuel pool of unit 3 at Fukushima Daiichi today as work was under way to remove parts of the fuel handling machine. The fuel crane fell into the spent fuel pool during the massive explosion at unit 3. TEPCO has been taking the crane out in sections. Oil from the crane leaked into the pool as a section was removed. The cooling loop for the spent fuel pool … Read entire article »
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Frozen Wall Delayed As More Concreting At Fukushima Daiichi
TEPCO announced a two week delay in work to install a frozen underground wall around the leaking reactors at Fukushima Daiichi. The work has been interrupted by a sudden rush to concrete the unit 3 water handling trench. The change of plans includes what NHK described as an effort to concrete the interface areas between the buildings and the trenches in an attempt to block contaminated water flows. Earlier this year NRA stated that the plant … Read entire article »
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TEPCO Begins Concreting Unit 3 Trench
TEPCO concreted the unit 3 trench in some unannounced work at Fukushima Daiichi. The unit 2 cable trench had been previously concreted in. Japan’s NRA had recently announced they assume the plant is still leaking out to sea, possibly beneath the wall blocking efforts at the plant. This effort to concrete in the unit 3 trench had not been previously announced and the area had not had any unusually high levels of contamination compared to … Read entire article »
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TEPCO Admonished For Corner Cutting That Caused Massive 2014 Fukushima Radiation Release
NRA has issued an administrative order over the misuse of spray dust inhibitors. While the subject sounds benign, this corner cutting caused the massive release of contaminated dust from the plant that was the biggest release from the plant since the initial disaster. The dust inhibitor liquid used at the plant was supposed to have a 10 part dilutions. TEPCO was diluting it by 100. NRA also found that they were not using it often enough. Instead of spraying it daily or right before work they were only spraying it every few days or few weeks and at these highly diluted rates. This effort to cut corners caused twelve workers at the plant to be contaminated, was found in offsite monitoring nearby and was detected all the way in Miyagi prefecture … Read entire article »
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Fukushima Unit 3 Dust Disperal Hints At Accident Events
TEPCO’s report on contaminated dust dispersal that ended up contaminating rice fields north of the damaged nuclear site may indicate more about the accident events. The dates where they were removing the sections of the crane and underlying debris from directly over the reactor well coincide with the contamination dates. TEPCO additionally cited that those days lacked rain that otherwise could have helped keep dust from flying away in the wind. The events combined with … Read entire article »
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Fukushima Refueling Machine Portion Falls In Spent Fuel Pool
TEPCO is reporting that the console portion of the refueling machine that fell into the spent fuel pool of unit 3 during the initial explosion has now fallen further into the pool. Workers were attempting to remove the section of the refueling machine from the pool when it broke loose and fell into the pool. TEPCO thinks it fell into a section of the pool beside the fuel racks but will be doing an underwater camera inspection … Read entire article »
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TEPCO To Begin Unit 3 Crane Removal From Spent Fuel Pool
A brief note in the daily reports mentioned that TEPCO will be pausing cooling to the unit 3 spent fuel pool again. This time it is to begin work to remove the refueling crane that fell into the pool during the blast. This work is obviously risky to an extent as they try to remove the heavy refueling crane from the damaged fuel pool. TEPCO previously installed a flexible dam in the pool to try … Read entire article »
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Fukushima Unit 3 Reactor Vessel Failure Preceded Explosion
As part of TEPCO’s admission that 100% of the unit 3 core has melted and left the reactor vessel, they included this new information seen in the graph below. The graph shows the times of events related to the melted fuel. TEPCO now estimates the reactor vessel failed just after about 7 am on March 14th. The pedestal line shows a very rapid shift from the reactor vessel to the pedestal. Not the gradual transition seen between the core and the lower plenum. It also shows between about 6 am on March 14th and 1 pm on March 14th that the molten fuel mass significantly migrated from the pedestal to the drywell of the containment structure. This transition activity from reactor vessel, to pedestal to drywell happened over a 7 … Read entire article »
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TEPCO Admits Unit 3 Had Total Melt Through
TEPCO has admitted that the fuel at unit 3 had a complete melt through. This is where 100% of the fuel melts and drops into the containment vessel. TEPCO previously estimated 60% of the fuel melted through. They now claim that the HPCI (cooling system) ceased working at 5:30 am March 13, 5 hours earlier than the previous estimate. This was 26 hours before the massive hydrogen and steam explosion at unit 3. This piece of … Read entire article »
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Fukushima Trench Freezing Failures & Tactics Technical Report
Update: Added table of sea water data at the end and another TEPCO handout on the work released this week. TEPCO admitted a few weeks ago to METI that the trench freezing operation underway for units 2 and 3 was not working. TEPCO initially provided few details but did give a detailed report to METI. Today TEPCO released some ideas for how they intend to overcome the problems but didn’t make the details of the problems … Read entire article »
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Fukushima Unit 3 Demolition Spread Contamination 50km, Multiple Instances
More information has come out about the contamination caused by the demolition work on unit 3. It was not the government, or TEPCO who found this was happening. Researchers from Kyoto University confirmed the problem in March 2014 and alerted the government. Had the university not been operating dust monitors on a regular basis, this issue likely would not have been admitted or known. 4 trillion becquerels were released in the August 19th incident and spread … Read entire article »
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4 Trillion Becquerels Released Over 4 Hours From Unit 3 During Demolition
Yahoo News is reporting that over a 4 hour period of demolition work on unit 3 in August 2013, 4 trillion becquerels of contamination were disbursed into the air. Monitoring stations at Futaba, Namie and at the plant were used to make the estimate. It was estimated that a radiation rate of .04 bq/cm was deposited on nearby lands. Plant monitoring for the related dates at Fukushima Daiichi didn’t show significant changes to the monitoring … Read entire article »
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TEPCO Contaminated Nearby Town During Unit 3 Demolition
TEPCO has admitted to re-contaminating the area around Minamisoma after being confronted by the agriculture ministry. Rice in Minamisoma was found to be over the government radiation limit of 100 bq/kg. Upon further inspection the ministry found it was the outside of the rice plants that had the most contamination rather than the rice kernel itself. This indicated contamination fell on the plants rather than being taken up from the soil. Now TEPCO is admitting on … Read entire article »
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TEPCO Submits Plan For Fuel Removal At Unit 3 Fukushima Daiichi
TEPCO submitted plans to the NRA for spent fuel removal from unit 3. This included more detail on how they intend to install a cover and remove transit casks from the building. The defueling building cover bridges the original reactor building, putting the load on the existing scaffolding system and an accessory building. This structure avoids contact with the reactor well, known to have high radiation levels. TEPCO did not mention any measures to prevent radiation issues from the fuel canal between the reactor and the spent fuel pool. They also do not mention anything about worker exposures or how human work would be conducted. Estimated radiation levels in the area are as high as 1 sievert/hour. The fuel casks would be moved out of the pool to the left side … Read entire article »
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TEPCO Begins Decontamination Of Unit 3 First Floor
TEPCO has begun the further decontamination of the first floor of unit 3. Robots Meister and Sora are doing the work, Meister is hooked to a vacuum collector rig outside the building. Misc debris not already removed is being collected and some surface cleaning is being done. This is an attempt to lower contamination levels further to allow human sustained entry into the building. http://www.tepco.co.jp/en/nu/fukushima-np/handouts/2014/images/handouts_140620_06-e.pdf This article would not be possible without the extensive efforts of the … Read entire article »
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Fukushima Unit 3 Spent Fuel Pool Debris Removal Progress
TEPCO has progressed on removing debris from the unit 3 spent fuel pool. The current work is to dismantle the fuel handling crane piece by piece and remove it from the pool. The trolley, main hoist and roof trussing that was above the crane have already been removed. Once the last of the fuel handling crane is removed work will begin to remove debris from the cask handling area of the pool. Cask area debris … Read entire article »
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Fukushima Unit 3 Leak Found, Unit 1 Loses Containment Pressure Monitoring
Two significant admissions were made by TEPCO at the end of the week. Unit 3 Scope work into the unit 3 MSIV room found multiple locations where steam pipes were leaking. The handout appears to show locations on the joints of the pipes before the main steam isolation valves where they found leaks. The section where these pipes go through the containment wall have rust traces as if those locations may also be leaking. These are obviously … Read entire article »
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Fukushima Unit 3; MSIV Shows Considerable Damage
TEPCO completed an initial inspection of the unit 3 MSIV room that houses valves critical to shutting down the reactor. The room showed considerable damage compared to the same room in unit 2. The damage indicates the room likely had high heat and large amounts of steam for an extended period of time. Water in the room appeared to be leaking from a lower location where the steam pipes are located and not from a … Read entire article »
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Fukushima Unit 3 Crane Leaks Oil Into Spent Fuel Pool
The refueling crane that crashed into the spent fuel pool of unit 3 has begun leaking oil into the pool. Work is underway to remove the crane from the pool, this may have caused the leak. TEPCO shut off the cooling system for the pool yesterday and reports today that the temperatures in the pool have not increased in any significant way. They have not declared a plan to deal with the oil in the … Read entire article »
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Fukushima Unit 3 Shield Wall Installation Begins
Decontamination work and installation of a shield wall around the reactor well has begun at unit 3 Fukushima Daiichi. The colored sections on the diagram indicate where various types of decontamination will be attempted before the shield wall will go up around the reactor well. The hope is to cut down on radiation from the area so workers can be closer to the refueling floor and to cut down on radiation impact it is causing … Read entire article »
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Fukushima Unit 3 Fuel Pool Debris Removal Progress
TEPCO has accomplished some debris removal from the spent fuel pool as documented in this report. Earlier in 2014 work was conducted to remove debris that was primarily rebar and handrails. Work in March began to focus on removal roof trussing so they could get closer to removing the fuel handling machine and mast. The pool is still quite full of fine debris on top of the fuel racks as can be seen in the photo. … Read entire article »
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